Abstract: In a rotary gas compressor which has a compression housing, in which the gas compressing elements are operatively confined, a shaft and bearing housing is provided. The latter housing is removably coupled to an end of the compression housing, and supports therein the rotary shaft and the bearings therefor. The bearings are located in a portion of the shaft and bearing housing which is outboard or external of the compression housing. A coolant chamber is set abut the shaft and bearing housing whereat the bearings are located. The latter housing further has apertures formed therein to visually expose the shaft, as well as for discharging therethrough any leaking lubricant.

Abstract: A housing, having therein only one, driven, rotatable drum, receives sheet paper for in-folding or Z-folding, selectively. Abutments, within the housing, delimit travel of the leading edge of the paper, causing the paper to buckle, there behind, and form a nip or fold; the latter is directed between the drum and a guide to one of the abutments, causing the paper to fold again. Then the fully folded paper is discharged from the housing. One of the abutments is retractable, to accommodate a Z-fold, or extendable to enable an in-fold.

Abstract: A flexible leaf causes the gummed flap of an envelope to enter a chamber in which a moistening element is exposed. In addition, a pivoted and spring-biased element yields upon engagement of the envelope spine therewith. Further movement of the envelope wipes the flap across the moistening element, and the spring-biased element presses the moistened flap against the body of the envelope.

Abstract: A windowed housing attracts an animal to feed confined with a feed reservoir, but a limb set across the window frustrates the animal's attempt to access the feed. Pawing or pulling at the obstructing limb rotates a rod which opens a feed gate to discharge the feed into an underlying feed chamber. An opening in the chamber gives the animal access to the discharged feed, but release of the limb, to access the chamber-received feed, allows the feed gate to close.

Abstract: Volume ratio and capacity are controlled by slides which are rail guided. The slides are pressure-balanced, axillay and radially. The volume ratio slide has a piston balancing arrangement. The capacity slide has suction pressure acting equally on all sides thereof, consequently it requires no piston balancing.

Abstract: A body of limited compressibility, and uniform thickness, defines a support for the posterior of an exerciser during sit-ups, stomach exercises, and the like. A void in the body nestably receives the coccyx area of the exerciser. The body further has an extended member for supporting the exerciser's back, and an elongate void formed in the member comfortably receives the spinal length of the exerciser. Nodules line the edges of the elongate void; these repeatedly knead spine-attached muscles as the exerciser works, supine, on the body.

Abstract: A door closure delay system produces a first signal when a person approaches a doorway housing the door. The first signal is applied to a timing system and a voltage comparator so that a second signal is produced to limit closure of an open door. The second signal is maintained for a predetermined and adjustable time period after the first signal has been removed. More patricularly, a voltage regulator provides a base or reference voltage to the comparator. A sensor, monitoring the doorway or portal, provides a signal voltage to the comparator when a physical presence is in, or in proximity to the doorway. The comparator passes on an output voltage which is stretched (i.e., has its time line extended) to circuitry coupled to a door closer, to delay the closure of the door by the closer.

Abstract: A link, used to allow retraction of the latchbolt against the bias of a spring, is formed of a fusible material to insure that, in the presence of intense heat, the link will melt and will no longer override a deadlocking pawl to allow the latchbolt to be withdrawn.

Abstract: A transparent game platform has a panel of ferrous metal slidably underlying for causing game pieces, with magnetic elements therein, to adhere to the platform where and when emplaced thereon. However, the panel is extractable from under the platform, to render the latter magnetically passive, so that game pieces can be displaced about the platform with slidable ease. Consequently, the game platform can be made non-magnetic to accommodate a free, slidable movement of game pieces thereon, as appropriate for whatever shall be the game, or can be made magnetic (a) to hold the game pieces in place, and (b) to accommodate storage of the platform and game pieces in an at-halt disposition thereof, respectively.

Abstract: A body, having a straight-edged rule fixed thereto, and transverse thereto, slidably receives a pair of blocks which also have straight-edged rules fixed thereto. All the rules are parallel, and one thereof is used to engage a proximate wall surface, while the other two are adjustably set to take the measure across a last-laid tile. Then, the first, which engages the wall surface is fully retracted, while the adjustably-set other two rules are advanced, with the body, to the wall surface. The outermost rule, then, along its straight edge, defines whereat a next tile is to be cut to fit an undersized space.

Abstract: In the floor of a pulp slurry inlet chamber an opening is provided. The opening is elongate and arranged substantially tangential to the outer, bounding wall of the chamber. Barriers of arcuate cross-section depend from the opening, at opposite ends of the opening. The barriers are incurvate, relative to the opening. The opening has a length across which junk cannot bridge. Consequently, the junk falls through the opening and is captured in an accumulator which underlies the opening. Knots substantially bridge across the opening, and impinge upon the arcuate barrier at the far end of the opening to be thrown upwardly for assimilation with the slurry flow coursing through the chamber. An elutriative liquid is supplied to the accumulator, at a given flow velocity, to wash up and out of the accumulator any organic particles which, due to irregularities, pass through the opening, to return the organic particles to the chamber.

Abstract: A cylindrical gas compressor has inlet valves confined therewithin, at opposite ends thereof, and discharge valves, shaft-mounted therebetween, for reciprocation to ingest and compress admitted gas. Outboard of the inlet valves are circular plates from which extend a plurality of fingers. The plates are confined within chambers in the compressor, and radial ports are provided for admitting pressured fluid to the plates to cause them to move inboard, whereby the fingers penetrate the inlet valves and remove the inlet valve valving elements off the valve seat, effecting unloading of the inlet valves. Springs hold the plates outboard of the inlet valves, to allow the valves to function normally-loaded, in the absence of the plate-displacing, ports-admitted, pressured fluid.

Abstract: Inlet valves, in a fluid-pressuring cylinder, are biasingly held in given operative positions where they occlude passageways, formed in the cylinder, which open at opposite ends onto the cylinder interior and the cylinder exterior. When an incompressible slug of liquid enters the cylinder, the relevant valve retracts against the bias thereof to expose the passageway, whereby the risk of over-pressuring is avoided, and the excess pressure is simply vented through the passageway(s), directly to the exterior of the cylinder.

Abstract: A body, having a straight-edged rule fixed thereto, and transverse thereto, slidably receives a pair of blocks which also have straight-edged rules fixed thereto. All the rules are parallel, and one thereof is used to engage a proximate wall surface, while the other two are adjustably set to take the measure across a last-laid tile. Then, the first, which engages the wall surface is fully retracted, while the adjustably-set other two rules are advanced, with the body, to the wall surface. The outermost rule, then, along its straight edge, defines whereat a next tile is to be cut to fit an undersized space.

Abstract: An axle, supported in a pair of brackets, and having wheels mounted to ends thereof, also pivotably carries a utility tray thereon. The brackets are provided for bolting thereof to leg members of a chair frame, to wheel the frame. The chair frame is collapsible, and the tray can be folded-up, unobtrusively with the component parts of the chair frame, or disposed prominently therefrom for wheeled transport of supplies and/or articles. With the chair frame expanded, into its seating disposition, the tray assumes a position substantially parallel with the seat frame, and therebelow, and the wheels are elevated in non-load-bearing disposition.